feat: add Home Assistant MQTT Discovery integration - #26
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Adds a new `home-assistant` Cargo feature that enables direct HA MQTT
Discovery publishing from the ESP32 — no Node-RED bridge required.
On every MQTT connect the firmware publishes retained discovery configs
to `homeassistant/{sensor,binary_sensor}/maratui_*/config`, then streams
state updates alongside the existing `mara/*` topics at ~1 Hz.
Changes:
- New `src/home_assistant.rs` module: enqueues discovery configs on
connect, telemetry states per frame, event-derived states, and status
states from DeviceInfo
- `MqttOutboundMessage` gains `retain` and `absolute` flags; publish
functions in setup.rs / setup_simulator.rs handle retained and
absolute-topic messages
- `GlobalAppState` gets `last_shot_ended_at` for the time-since-last-shot
sensor; FSM sets it on ShotEnded / ShotAborted
- `app.rs`: `take_outbound_mqtt_messages` now returns the full struct
instead of tuples; trait gains `enqueue_home_assistant`
- Build commands: `cargo run --release --features home-assistant`,
`cargo simha`, `make flash-ha / sim-ha`
- Removes `docs/node-red-ha-bridge.json`
- Adds `docs/ha-automation.yaml` (cup counter HA automation, replaces
the Node-RED automation)
- Updates `docs/home-assistant.md` for the new direct approach
State updates now publish to `{prefix}/ha/{id}` (e.g. `mara/ha/mode`,
`mara/ha/boiler_now`) instead of `homeassistant/sensor/maratui_*/state`.
Discovery configs are unchanged — `homeassistant/*/config` still points
to the correct state_topic, now under the device prefix.
Adds `GlobalAppState::mqtt_topic_prefix` (set on init from AppConfig) so
state-publishing functions have access to the prefix without needing it
passed as a parameter at every call site.
…or|binary_sensor/maratui/
Instead of a flat maratui_{id}/state per sensor, state topics are now
grouped under a shared device subtopic:
homeassistant/sensor/maratui/{id}
homeassistant/binary_sensor/maratui/{id}
Discovery config topics (homeassistant/sensor/maratui_{id}/config) are
unchanged.
…nfig topics
Change config topic format from homeassistant/sensor/maratui_{id}/config
to homeassistant/sensor/maratui/{id}/config (4-segment HA Discovery form).
Now config and state share the same base path:
homeassistant/sensor/maratui/mode/config <- discovery
homeassistant/sensor/maratui/mode <- state
Update documentation to explain how to enable native Home Assistant integration using the `--features home-assistant` build flag. This allows the firmware to publish discovery configurations directly, eliminating the need for a Node-RED bridge.
Add a note regarding MQTT broker requirements and Home Assistant configuration steps to ensure successful discovery.
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Summary
Build commands
```bash
Device
cargo run --release --features home-assistant
make flash-ha
Simulator
cargo simha
make sim-ha
```
Test plan